Device for elastically deforming a printing plate

Abstract

A device for elastically deforming a printing plate clamped on a plate cylinder having a longitudinal channel formed therein includes a first tensioning device mounted in the longitudinal channel for tensioning the printing plate in circumferential direction of the plate cylinder, a second tensioning device for elastically deforming an end of the printing plate in longitudinal direction of the plate cylinder, and a servomotor connected to the second tensioning device for actuating the second tensioning device, the second tensioning device including an hydraulic power converter.

I claim: 
     
       1. A device for elastically deforming a printing plate clamped on a plate cylinder having a longitudinal channel formed therein, comprising first tensioning means mounted in the longitudinal channel for tensioning the printing plate in circumferential direction of the plate cylinder, second tensioning means for elastically deforming an end of the printing plate in longitudinal direction of the plate cylinder, and a servomotor connected to said second tensioning means for actuating said second tensioning means, said second tensioning means including an hydraulic power converter. 
     
     
       2. Device according to claim 1, wherein said hydraulic power converter includes a working piston, a control piston having a diameter smaller than the diameter of the working piston, and an hydraulic-fluid supply enclosed in a housing between said working piston and said control piston, said housing being a guide for said working piston and said control piston. 
     
     
       3. Device according to claim 2, including a transmission drivable by an output shaft of the servomotor, said transmission having a translatorially adjustable output element for adjusting said control piston. 
     
     
       4. Device according to claim 2, wherein said working piston and said control piston are arranged coaxially to one another, and said working piston is formed with a central blind bore for receiving said control piston therein, a lateral wall defining said blind bore and said control piston defining an annular gap therebetween. 
     
     
       5. Device according to claim 2, including an adjustable tensioning element braced against said first tensioning means for applying a deformation force acting in the longitudinal direction of the plate cylinder to the printing plate, said tensioning element being articulatingly connected to said working cylinder. 
     
     
       6. In a device for elastically deforming a printing plate clamped onto a plate cylinder, tensioning means for elastically deforming an end of the printing plate in the longitudinal direction of the plate cylinder, the tensioning means comprising an hydraulic power converter.